Ac loss reduction of multilayer superconducting power transmission cables by using narrow coated conductors

Amemiya, Naoyuki; Li, Quan; Ito, Kaoru; Takeuchi, Keigo; Nakamura, Taketsune; Okuma, Takeshi

doi:10.1088/0953-2048/24/6/065013

Cited by 20 publications

(10 citation statements)

References 26 publications

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“…Aiming to power cable manufacturing with 2G wire, several topologies are being considered in order to approach transposition: CORC (Conductor on Round Core) [10,11], Roebel [12,13], Helicoidal [14] and twisted stacked wires [15][16][17]. Between all proposals suggested, twisted stacked wires, appear as the simplest design.…”

Section: Introductionmentioning

confidence: 99%

Torsional Dependence of the Critical Current in 2G Tapes

Sotelo

Granados

Carrera

et al. 2016

IEEE Trans. Appl. Supercond.

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Since the second generation (2G) superconducting wires started to be produced in a large scale almost a decade ago, the quality of the materials manufactured has been continually improved. Every year the manufacturers present new materials with better electrical properties, increasing the critical current density, critical magnetic field and the total length produced with continuous homogeneity. The mechanical properties of the coated conductor should be taken in account, since electro-dynamical forces appear in working conditions as stress in the cooling and heating processes. In applications as fault current limiters, SMES, transformers, electromagnets, motors, cables, etc., the consideration of them is mandatory to the project of those devices. In this context, the present work studies the electrical and mechanical properties of 12 mm 2G wires samples under torsion without axial tension. Critical current is measured as a function on the torsion angle. Details of the experiment and their results are here presented.

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Section: Introductionmentioning

confidence: 99%

Torsional Dependence of the Critical Current in 2G Tapes

Sotelo

Granados

Carrera

et al. 2016

IEEE Trans. Appl. Supercond.

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“…For other coated conductors, there have been discussions of the preferable width of coated conductors for AC loss reduction [17]- [22]. Among them, references [18], [21] demonstrated that narrow 2 mm coated conductors are more profitable than 4 mm coated conductors for AC loss reduction in multilayer cables. And reference [22] pointed out and numerically proved that, comparing to 4 mm coated conductors, narrow 2 mm coated conductors can effectively reduce AC loss for both monolayer and multilayer outer-diameter-fixed cables.…”

Section: Introductionmentioning

confidence: 99%

Effect of Multilayer Configuration on AC Losses of Superconducting Power Transmission Cables Consisting of Narrow Coated Conductors

Tan

2014

IEEE Trans. Appl. Supercond.

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Superconducting power transmission cables are regarded as a key to realize the next-generation power systems with high capacity and high efficiency, and 4 mm coated conductors have been broadly used as a standard to develop such cables. Recent research shows that, comparing with standard 4 mm coated conductors, narrow 2 mm coated conductors prove to have a pronounced advantage on AC loss reduction for superconducting cables. Besides, thanks to laser cutting technique, it became possible to cut wide coated conductors into small tapes as narrow as 2 mm without considerable damage. Hence, narrow 2 mm coated conductors are attracting more and more attentions and have turned into a potential option for developing more efficient superconducting cables. So far, there have been many discussions on AC loss characteristics of the superconducting cables consisting of 4 mm coated conductors, whereas, the studies on cables comprising narrow 2 mm coated conductors are very few. This paper is to clarify the AC loss characteristics of superconducting cables consisting of narrow 2 mm coated conductors, especially to analyze the dependence of AC loss on the number of layers, with the intention of studying the effect of multilayer configuration on AC losses of such cables. A set of numerical models simulating such superconducting cables have been developed by applying 2-D FEM method. This set of models comprises 1-layer, 2-layer, 4-layer and 6-layer cables, with the former three types of cables as practical cables under development and the last one as a future option. Narrow 2 mm coated conductors with the same critical current and current distribution were selected for all the cables. Within these cables, numerical electromagnetic field analysis has been carried out for AC loss calculation and comparison.Index Terms-AC loss, multilayer configuration, narrow 2 mm coated conductors, superconducting power transmission cable. 1051-8223

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“…Ac losses in coated conductors in a superconducting power transmission cable are dominated by the magnetic field component normal to its superconductor layer [1], which is generated by the distortion of the magnetic field enclosing a layer consisting of coated conductors [2][3][4][5]. It should be noted that the ac losses in coated conductors in a particular layer are influenced substantially by the magnetic fields generated by the current in other layers [5]. Considering that the magnetic field is distorted at the gaps between coated conductors, the ac losses in the particular layer could be influenced by the relative positions of gaps in the adjacent layers.…”

Section: Introductionmentioning

confidence: 99%

Ac loss analyses of superconducting power transmission cables considering their three-dimensional geometries

Amemiya

Nishino

Takeuchi

et al. 2013

Physica C: Superconductivity

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Numerical electromagnetic field analyses of superconducting power transmission cables consisting of coated conductors were made considering their three-dimensional spiraled structures. Thin strips of superconductor were wound spirally around a round former to represent a layer in a cable. The analyses were made for two-layer cables where the spiral pitch of the inner layer and that of the outer layer are different. A non-uniform lateral critical current density distribution, a trapezoidal distribution with shoulders, was assumed across each coated conductor. The calculated ac losses were compared with measured ones. The influence of the relative positions between the inner-layer coated conductors and the outer-layer coated conductors on the current distribution across each coated conductor as well as ac losses was discussed. The influence of the current distribution between layers, determined by the spiral pitches, on the ac losses was also studied.

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Ac loss reduction of multilayer superconducting power transmission cables by using narrow coated conductors

Cited by 20 publications

References 26 publications

Torsional Dependence of the Critical Current in 2G Tapes

Torsional Dependence of the Critical Current in 2G Tapes

Effect of Multilayer Configuration on AC Losses of Superconducting Power Transmission Cables Consisting of Narrow Coated Conductors

Ac loss analyses of superconducting power transmission cables considering their three-dimensional geometries

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